You are right that I don't gig anymore, but I do play loud sometimes :lol: These pickups don't feedback as much as you would expect. I am really impressed with them. I tried them into my new 8 watt custom amp (Marshall tone stack with 6V6 power amp). They sound great, actually the neck pickup reminded me of Eric Bell's tone on Whiskey in the Jar (I just happened to be listening to it in the car with TO last night!). The bridge pickup is brighter, as you would expect and can drive the amp nicely when you have it cranked a bit. As you would expect with a 335, harmonic feedback is great and the SM's really do this well.
Mine are Alnico II magnets, 7.7K bridge and 7.0 neck (very close to the original T-tops which were 7.0 bridge and 7.47 neck).
Here are some shots of the work in progress - you can see the string I had connecting the Treble volume and tone pots so that I could get them back in place, and you can also see the hole into the body below the bridge PU. The other shot is the guitar all back together and looking great.